In a non-announcement, the Apple Store is now listing a "Cluster Node" configuration for the Xserve product that includes no video card, no second gigabit Ethernet card and no additional drive space, but costs only 2/3 of the price of the entry level 1.33GHz dual-processor configuration.

It appears to be a completely headless version of the server for operation in computational clusters, such as would be found in the biological engineering and computer graphics fields.